Adjust Development > Applications form to more clearly support multiple redirect_uris

[ThisIsMissEm]

Pitch

Change the Development > Application form to more clearly explain that multiple Redirect URIs are supported for OAuth Applications.

It may also be better to add some javascript here and have an add button which adds an empty redirect URI form field, and a remove button per Redirect URI.

Motivation

Currently this form shows the redirect_uris as a textarea labelled "Redirect URI", there is a hint that multiple Redirect URIs are supported, though it's somewhat unclear: "Use one line per URI".